SUMMARY OF DESIGN PATTERNS IN JAVA

• Creational patterns deal with the creation of objects. They provide a way to encapsulate the process of creating objects so that it can be easily reused and modified. Some of the most popular creational patterns in Java include:
• Singleton ensures that there is only one instance of a class in a program.
• Factory Method defines an interface for creating objects but leaves the actual implementation of the objects to subclasses.
• Abstract Factory provides a way to create families of related objects without specifying their concrete classes.
• Builder separates the construction of a complex object from its representation.
• Prototype creates a new object by copying an existing object.
• Structural patterns deal with the way that objects are composed together. They provide a way to create structures of objects that are both flexible and maintainable. Some of the most popular structural patterns in Java include:
• Adapter converts the interface of one class into an interface that another class expects.
• Bridge decouples an abstraction from its implementation so that the two can vary independently.
• Composite represents a group of objects that are treated as a single object.
• Decorator attaches additional responsibilities to an object dynamically.
• Facade provides a simplified interface to a complex system.
• Behavioral patterns deal with the way that objects interact with each other. They provide a way to define the relationships between objects and how they communicate with each other. Some of the most popular behavioral patterns in Java include:
• Chain of Responsibility delegates a request to a chain of objects until one object handles it.
• Command encapsulates a request as an object, thereby enabling greater flexibility in handling requests.
• Interpreter defines a grammar and interprets sentences in that grammar.
• Iterator provides a way to traverse a collection of objects.
• Mediator defines an object that encapsulates how a set of objects interact with each other.
• Observer defines a one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically.
• State allows an object to change its behavior based on its internal state.
• Strategy defines a family of algorithms, encapsulates each one, and makes them interchangeable.
• Template Method defines the skeleton of an algorithm in an operation, deferring some steps to subclasses.

These are just a few of the many design patterns that are available in Java. By understanding and using design patterns, software developers can create more flexible, extensible, and maintainable code.